Add an analyzer_cli option to disable analysis (for faster summary generation)

pkg/analyzer_cli/lib/src/options.dart

Index: pkg/analyzer_cli/lib/src/options.dart
diff --git a/pkg/analyzer_cli/lib/src/options.dart b/pkg/analyzer_cli/lib/src/options.dart
index 732fc635ebb5d74be08b5d72d67636e55d920acb..111650e425881dc5b4a966ee153426b193d6f3a4 100644
--- a/pkg/analyzer_cli/lib/src/options.dart
+++ b/pkg/analyzer_cli/lib/src/options.dart
@@ -86,6 +86,9 @@ class CommandLineOptions {
   /// Mapping of package names to package summary file paths.
   final Map<String, String> packageSummaryInputs;
 
+  /// Whether to skip analysis when creating summaries.
+  final bool packageSummaryOnly;
+
   /// The path to find the package summary.
   final String packageSummaryOutput;
 
@@ -138,6 +141,7 @@ class CommandLineOptions {
         packageModePath = args['package-mode-path'],
         packageName = args['package-name'],
         packageSummaryInputs = _parsePackageSummaryInputs(args),
+        packageSummaryOnly = args['package-summary-only'],
         packageSummaryOutput = args['package-summary-output'],
         packageConfigPath = args['packages'],
         packageRootPath = args['package-root'],
@@ -313,6 +317,11 @@ class CommandLineOptions {
           help: 'Specifies the path to the file where the summary information '
               'about the package should be written to.',
           hide: true)
+      ..addFlag('package-summary-only',
+          help: 'Disable analysis (only generate summaries).',
+          defaultsTo: false,
+          negatable: false,
+          hide: true)
       //
       // Hidden flags.
       //